package com.huadu.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.huadu.constant.MessageConstant;
import com.huadu.dto.UserLoginDTO;
import com.huadu.entity.User;
import com.huadu.exception.LoginFailedException;
import com.huadu.mapper.UserMapper;
import com.huadu.properties.WeChatProperties;
import com.huadu.service.UserService;
import com.huadu.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

/**
 * @date 2024/3/17 23:43
 */
@Service
@Slf4j
public class UserServicelmpl implements UserService {
    public static final String WX_LOGIN="https://api.weixin.qq.com/sns/jscode2session";
    @Autowired
    private WeChatProperties weChatProperties;
    @Autowired
    private UserMapper userMapper;
    /**
     * 微信登陆
     * @param userLoginDTO
     * @return
     */
    public User wxLogin(UserLoginDTO userLoginDTO) {
        String openid = getOpenid(userLoginDTO.getCode());
        //判断openid是否为空
        //判断是否有异常情况，可以直接if存在异常，如果没有，大概率是正常情况。
        if (openid==null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }
        //判断是否已有用户
        User user = userMapper.getByOpenid(openid);
        if (user==null){
            user=User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);
        }


        return user;
    }

    /**
     * 获取openid
     * @param code
     * @return
     */
    private String getOpenid(String code){
        Map<String, String> map=new HashMap<>();
        map.put("appid",weChatProperties.getAppid());
        map.put("secret",weChatProperties.getSecret());
        map.put("js_code",code);
        map.put("grant=type","authorization_code");
        String josn=HttpClientUtil.doGet(WX_LOGIN,map);

        JSONObject jsonObject=JSON.parseObject(josn);
        String openid = jsonObject.getString("openid");
        return openid;
    }
}
